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Title: α- tocopherol’s location in membranes is not affected by their composition

Journal Article · · Langmuir
DOI:https://doi.org/10.1021/la502605c· OSTI ID:1330532
 [1];  [2];  [3];  [1]
  1. Brock Univ., St. Catharines, ON (Canada)
  2. Canadian Neutron Beam Centre, Chalk River, ON (Canada); Comenius Univ., Bratislava (Slovakia); Joint Institute for Nuclear Research, Moscow Region (Russia)
  3. Brock Univ., St. Catharines, ON (Canada); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Joint Institute for Neutron Sciences, Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

To this day, α-tocopherol's (aToc) role in humans is not well known. In previous studies, we have tried to connect aToc's biological function with its location in a-lipid bilayer. In the present study, we have determined, by means of small-angle neutron diffraction, that not only is aToc's hydroxyl group located high in the membrane but its tail also resides far from the center of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayers. In addition, we located aToc's hydroxyl group above the lipid backbone in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE), 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine (POPS), and Sphingomyelin bilayers, suggesting that aToc's location near the lipid water interface may be a universal property of vitamin E. Lastly, in light of these data, how aToc efficiently terminates lipid hydroperoxy radicals at the membrane center remains an open question.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1330532
Journal Information:
Langmuir, Vol. 31, Issue 15; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (6)

Does alpha-tocopherol flip-flop help to protect membranes against oxidation? posted_content September 2018
Hydroperoxyl Radicals (HOO . ): Vitamin E Regeneration and H-Bond Effects on the Hydrogen Atom Transfer journal October 2016
Lipid bilayer thickness determines cholesterol's location in model membranes journal January 2016
α-Tocopherol Is Well Designed to Protect Polyunsaturated Phospholipids: MD Simulations journal October 2015
Neutron Scattering at the Intersection of Heart Health Science and Biophysics journal June 2015
Vitamin E Circular Dichroism Studies: Insights into Conformational Changes Induced by the Solvent’s Polarity journal December 2016

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